refactor: use ajv instead of cafy (#8324)

* wip

* wip

* Update abuse-user-reports.ts

* Update files.ts

* Update list-remote.ts

* Update list.ts

* Update show-users.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* Update search.ts

* Update reactions.ts

* Update search.ts

* wip

* wip

* wip

* wip

* Update update.ts

* Update relation.ts

* Update available.ts

* wip

* wip

* wip

* Update packages/backend/src/server/api/define.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

* Update define.ts

* Update define.ts

* typo

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* wip

* Update signup.ts

* Update call.ts

* minimum for limit

* type

* remove needless annotation

* wip

* Update signup.ts

* wip

* wip

* fix

* Update create.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

46 files changed, 466 insertions, 581 deletions

diff --git a/packages/backend/src/server/api/endpoints/i/2fa/done.ts b/packages/backend/src/server/api/endpoints/i/2fa/done.ts
index 4853908693..8d82ab3886 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/done.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/done.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as speakeasy from 'speakeasy';
 import define from '../../../define';
 import { UserProfiles } from '@/models/index';
@@ -7,16 +6,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		token: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		token: { type: 'string' },
 	},
+	required: ['token'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const token = ps.token.replace(/\s/g, '');
 
 	const profile = await UserProfiles.findOneOrFail(user.id);
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts b/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
index 26e9a60886..5052afda97 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import { promisify } from 'util';
 import * as cbor from 'cbor';
@@ -14,35 +13,28 @@ import { procedures, hash } from '../../../2fa';
 import { publishMainStream } from '@/services/stream';
 
 const cborDecodeFirst = promisify(cbor.decodeFirst) as any;
+const rpIdHashReal = hash(Buffer.from(config.hostname, 'utf-8'));
 
 export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		clientDataJSON: {
-			validator: $.str,
-		},
-		attestationObject: {
-			validator: $.str,
-		},
-		password: {
-			validator: $.str,
-		},
-		challengeId: {
-			validator: $.str,
-		},
-		name: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		clientDataJSON: { type: 'string' },
+		attestationObject: { type: 'string' },
+		password: { type: 'string' },
+		challengeId: { type: 'string' },
+		name: { type: 'string' },
 	},
+	required: ['clientDataJSON', 'attestationObject', 'password', 'challengeId', 'name'],
 } as const;
 
-const rpIdHashReal = hash(Buffer.from(config.hostname, 'utf-8'));
-
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/password-less.ts b/packages/backend/src/server/api/endpoints/i/2fa/password-less.ts
index 854848a434..2830f8994a 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/password-less.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/password-less.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { UserProfiles } from '@/models/index';
 
@@ -6,16 +5,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		value: {
-			validator: $.boolean,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		value: { type: 'boolean' },
 	},
+	required: ['value'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	await UserProfiles.update(user.id, {
 		usePasswordLessLogin: ps.value,
 	});
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts b/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
index 057e54c69b..da3ff421a7 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import define from '../../../define';
 import { UserProfiles, AttestationChallenges } from '@/models/index';
@@ -13,16 +12,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
 	},
+	required: ['password'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/register.ts b/packages/backend/src/server/api/endpoints/i/2fa/register.ts
index c5cfb9dfad..32acc838b7 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/register.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/register.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import * as speakeasy from 'speakeasy';
 import * as QRCode from 'qrcode';
@@ -10,16 +9,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
 	},
+	required: ['password'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts b/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
index 03e1d0434d..3004ce36a1 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import define from '../../../define';
 import { UserProfiles, UserSecurityKeys, Users } from '@/models/index';
@@ -8,19 +7,19 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
-		credentialId: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
+		credentialId: { type: 'string' },
 	},
+	required: ['password', 'credentialId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts b/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
index a19ad6810d..b8e89bac72 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import define from '../../../define';
 import { UserProfiles } from '@/models/index';
@@ -7,16 +6,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
 	},
+	required: ['password'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/apps.ts b/packages/backend/src/server/api/endpoints/i/apps.ts
index 63999b0981..f45b6745b8 100644
--- a/packages/backend/src/server/api/endpoints/i/apps.ts
+++ b/packages/backend/src/server/api/endpoints/i/apps.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { AccessTokens } from '@/models/index';
 
@@ -6,21 +5,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		sort: {
-			validator: $.optional.str.or([
-				'+createdAt',
-				'-createdAt',
-				'+lastUsedAt',
-				'-lastUsedAt',
-			]),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		sort: { type: 'string', enum: ['+createdAt', '-createdAt', '+lastUsedAt', '-lastUsedAt'] },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = AccessTokens.createQueryBuilder('token')
 		.where('token.userId = :userId', { userId: user.id });
 
diff --git a/packages/backend/src/server/api/endpoints/i/authorized-apps.ts b/packages/backend/src/server/api/endpoints/i/authorized-apps.ts
index 52122b851b..e417f3e81a 100644
--- a/packages/backend/src/server/api/endpoints/i/authorized-apps.ts
+++ b/packages/backend/src/server/api/endpoints/i/authorized-apps.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { AccessTokens, Apps } from '@/models/index';
 
@@ -6,33 +5,26 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		offset: {
-			validator: $.optional.num.min(0),
-			default: 0,
-		},
-
-		sort: {
-			validator: $.optional.str.or('desc|asc'),
-			default: 'desc',
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		offset: { type: 'integer', default: 0 },
+		sort: { type: 'string', enum: ['desc', 'asc'], default: "desc" },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	// Get tokens
 	const tokens = await AccessTokens.find({
 		where: {
 			userId: user.id,
 		},
-		take: ps.limit!,
+		take: ps.limit,
 		skip: ps.offset,
 		order: {
 			id: ps.sort == 'asc' ? 1 : -1,
diff --git a/packages/backend/src/server/api/endpoints/i/change-password.ts b/packages/backend/src/server/api/endpoints/i/change-password.ts
index 7b6c137737..eac60ee183 100644
--- a/packages/backend/src/server/api/endpoints/i/change-password.ts
+++ b/packages/backend/src/server/api/endpoints/i/change-password.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import define from '../../define';
 import { UserProfiles } from '@/models/index';
@@ -7,20 +6,19 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		currentPassword: {
-			validator: $.str,
-		},
-
-		newPassword: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		currentPassword: { type: 'string' },
+		newPassword: { type: 'string', minLength: 1 },
 	},
+	required: ['currentPassword', 'newPassword'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/delete-account.ts b/packages/backend/src/server/api/endpoints/i/delete-account.ts
index e1eee949fc..6f689c0b4e 100644
--- a/packages/backend/src/server/api/endpoints/i/delete-account.ts
+++ b/packages/backend/src/server/api/endpoints/i/delete-account.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import define from '../../define';
 import { UserProfiles, Users } from '@/models/index';
@@ -10,16 +9,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
 	},
+	required: ['password'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 	const userDetailed = await Users.findOneOrFail(user.id);
 	if (userDetailed.isDeleted) {
diff --git a/packages/backend/src/server/api/endpoints/i/export-blocking.ts b/packages/backend/src/server/api/endpoints/i/export-blocking.ts
index 44d8a1cb38..afa6f2fc8e 100644
--- a/packages/backend/src/server/api/endpoints/i/export-blocking.ts
+++ b/packages/backend/src/server/api/endpoints/i/export-blocking.ts
@@ -11,7 +11,13 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createExportBlockingJob(user);
 });
diff --git a/packages/backend/src/server/api/endpoints/i/export-following.ts b/packages/backend/src/server/api/endpoints/i/export-following.ts
index 5d1617d57b..4dd8cda398 100644
--- a/packages/backend/src/server/api/endpoints/i/export-following.ts
+++ b/packages/backend/src/server/api/endpoints/i/export-following.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { createExportFollowingJob } from '@/queue/index';
 import ms from 'ms';
@@ -10,19 +9,18 @@ export const meta = {
 		duration: ms('1hour'),
 		max: 1,
 	},
-	params: {
-		excludeMuting: {
-			validator: $.optional.bool,
-			default: false,
-		},
-		excludeInactive: {
-			validator: $.optional.bool,
-			default: false,
-		},
+} as const;
+
+const paramDef = {
+	type: 'object',
+	properties: {
+		excludeMuting: { type: 'boolean', default: false },
+		excludeInactive: { type: 'boolean', default: false },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createExportFollowingJob(user, ps.excludeMuting, ps.excludeInactive);
 });
diff --git a/packages/backend/src/server/api/endpoints/i/export-mute.ts b/packages/backend/src/server/api/endpoints/i/export-mute.ts
index 27ce8f0b29..ca8a7b997c 100644
--- a/packages/backend/src/server/api/endpoints/i/export-mute.ts
+++ b/packages/backend/src/server/api/endpoints/i/export-mute.ts
@@ -11,7 +11,13 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createExportMuteJob(user);
 });
diff --git a/packages/backend/src/server/api/endpoints/i/export-notes.ts b/packages/backend/src/server/api/endpoints/i/export-notes.ts
index 25b1849e80..fc155d9d0f 100644
--- a/packages/backend/src/server/api/endpoints/i/export-notes.ts
+++ b/packages/backend/src/server/api/endpoints/i/export-notes.ts
@@ -11,7 +11,13 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createExportNotesJob(user);
 });
diff --git a/packages/backend/src/server/api/endpoints/i/export-user-lists.ts b/packages/backend/src/server/api/endpoints/i/export-user-lists.ts
index d28b699c5a..22cbf973f8 100644
--- a/packages/backend/src/server/api/endpoints/i/export-user-lists.ts
+++ b/packages/backend/src/server/api/endpoints/i/export-user-lists.ts
@@ -11,7 +11,13 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createExportUserListsJob(user);
 });
diff --git a/packages/backend/src/server/api/endpoints/i/favorites.ts b/packages/backend/src/server/api/endpoints/i/favorites.ts
index 92c767876b..45f5d99cce 100644
--- a/packages/backend/src/server/api/endpoints/i/favorites.ts
+++ b/packages/backend/src/server/api/endpoints/i/favorites.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { NoteFavorites } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:favorites',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -37,14 +20,24 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(NoteFavorites.createQueryBuilder('favorite'), ps.sinceId, ps.untilId)
 		.andWhere(`favorite.userId = :meId`, { meId: user.id })
 		.leftJoinAndSelect('favorite.note', 'note');
 
 	const favorites = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await NoteFavorites.packMany(favorites, user);
diff --git a/packages/backend/src/server/api/endpoints/i/gallery/likes.ts b/packages/backend/src/server/api/endpoints/i/gallery/likes.ts
index f1c5763593..dc862a6b05 100644
--- a/packages/backend/src/server/api/endpoints/i/gallery/likes.ts
+++ b/packages/backend/src/server/api/endpoints/i/gallery/likes.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { GalleryLikes } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:gallery-likes',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -44,14 +27,24 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(GalleryLikes.createQueryBuilder('like'), ps.sinceId, ps.untilId)
 		.andWhere(`like.userId = :meId`, { meId: user.id })
 		.leftJoinAndSelect('like.post', 'post');
 
 	const likes = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await GalleryLikes.packMany(likes, user);
diff --git a/packages/backend/src/server/api/endpoints/i/gallery/posts.ts b/packages/backend/src/server/api/endpoints/i/gallery/posts.ts
index d46d42f633..fbab8795ca 100644
--- a/packages/backend/src/server/api/endpoints/i/gallery/posts.ts
+++ b/packages/backend/src/server/api/endpoints/i/gallery/posts.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { GalleryPosts } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:gallery',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -37,13 +20,23 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(GalleryPosts.createQueryBuilder('post'), ps.sinceId, ps.untilId)
 		.andWhere(`post.userId = :meId`, { meId: user.id });
 
 	const posts = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await GalleryPosts.packMany(posts, user);
diff --git a/packages/backend/src/server/api/endpoints/i/get-word-muted-notes-count.ts b/packages/backend/src/server/api/endpoints/i/get-word-muted-notes-count.ts
index 4e1a4d3db9..2b31b89ff1 100644
--- a/packages/backend/src/server/api/endpoints/i/get-word-muted-notes-count.ts
+++ b/packages/backend/src/server/api/endpoints/i/get-word-muted-notes-count.ts
@@ -8,9 +8,6 @@ export const meta = {
 
 	kind: 'read:account',
 
-	params: {
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -23,8 +20,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	return {
 		count: await MutedNotes.count({
 			userId: user.id,
diff --git a/packages/backend/src/server/api/endpoints/i/import-blocking.ts b/packages/backend/src/server/api/endpoints/i/import-blocking.ts
index acc5797420..b90bfb1402 100644
--- a/packages/backend/src/server/api/endpoints/i/import-blocking.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-blocking.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { createImportBlockingJob } from '@/queue/index';
 import ms from 'ms';
@@ -15,12 +13,6 @@ export const meta = {
 		max: 1,
 	},
 
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -48,8 +40,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['fileId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const file = await DriveFiles.findOne(ps.fileId);
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
diff --git a/packages/backend/src/server/api/endpoints/i/import-following.ts b/packages/backend/src/server/api/endpoints/i/import-following.ts
index 35006746fb..75388502a5 100644
--- a/packages/backend/src/server/api/endpoints/i/import-following.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-following.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { createImportFollowingJob } from '@/queue/index';
 import ms from 'ms';
@@ -14,12 +12,6 @@ export const meta = {
 		max: 1,
 	},
 
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -47,8 +39,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['fileId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const file = await DriveFiles.findOne(ps.fileId);
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
diff --git a/packages/backend/src/server/api/endpoints/i/import-muting.ts b/packages/backend/src/server/api/endpoints/i/import-muting.ts
index 7bbb2e008e..e1c3df33e1 100644
--- a/packages/backend/src/server/api/endpoints/i/import-muting.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-muting.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { createImportMutingJob } from '@/queue/index';
 import ms from 'ms';
@@ -15,12 +13,6 @@ export const meta = {
 		max: 1,
 	},
 
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -48,8 +40,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['fileId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const file = await DriveFiles.findOne(ps.fileId);
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
diff --git a/packages/backend/src/server/api/endpoints/i/import-user-lists.ts b/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
index 759d41b6cd..eb1302a98c 100644
--- a/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { createImportUserListsJob } from '@/queue/index';
 import ms from 'ms';
@@ -14,12 +12,6 @@ export const meta = {
 		max: 1,
 	},
 
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -47,8 +39,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['fileId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const file = await DriveFiles.findOne(ps.fileId);
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
diff --git a/packages/backend/src/server/api/endpoints/i/notifications.ts b/packages/backend/src/server/api/endpoints/i/notifications.ts
index 59efd32bb2..bb1d6a49b3 100644
--- a/packages/backend/src/server/api/endpoints/i/notifications.ts
+++ b/packages/backend/src/server/api/endpoints/i/notifications.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import { readNotification } from '../../common/read-notification';
 import define from '../../define';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -16,44 +14,6 @@ export const meta = {
 
 	kind: 'read:notifications',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-
-		following: {
-			validator: $.optional.bool,
-			default: false,
-		},
-
-		unreadOnly: {
-			validator: $.optional.bool,
-			default: false,
-		},
-
-		markAsRead: {
-			validator: $.optional.bool,
-			default: true,
-		},
-
-		includeTypes: {
-			validator: $.optional.arr($.str.or(notificationTypes as unknown as string[])),
-		},
-
-		excludeTypes: {
-			validator: $.optional.arr($.str.or(notificationTypes as unknown as string[])),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -65,8 +25,27 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+		following: { type: 'boolean', default: false },
+		unreadOnly: { type: 'boolean', default: false },
+		markAsRead: { type: 'boolean', default: true },
+		includeTypes: { type: 'array', items: {
+			type: 'string', enum: notificationTypes,
+		} },
+		excludeTypes: { type: 'array', items: {
+			type: 'string', enum: notificationTypes,
+		} },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	// includeTypes が空の場合はクエリしない
 	if (ps.includeTypes && ps.includeTypes.length === 0) {
 		return [];
@@ -125,7 +104,7 @@ export default define(meta, async (ps, user) => {
 		query.andWhere(`notification.isRead = false`);
 	}
 
-	const notifications = await query.take(ps.limit!).getMany();
+	const notifications = await query.take(ps.limit).getMany();
 
 	// Mark all as read
 	if (notifications.length > 0 && ps.markAsRead) {
diff --git a/packages/backend/src/server/api/endpoints/i/page-likes.ts b/packages/backend/src/server/api/endpoints/i/page-likes.ts
index 59239c7446..e66bc616c2 100644
--- a/packages/backend/src/server/api/endpoints/i/page-likes.ts
+++ b/packages/backend/src/server/api/endpoints/i/page-likes.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { PageLikes } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:page-likes',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -44,14 +27,24 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(PageLikes.createQueryBuilder('like'), ps.sinceId, ps.untilId)
 		.andWhere(`like.userId = :meId`, { meId: user.id })
 		.leftJoinAndSelect('like.page', 'page');
 
 	const likes = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await PageLikes.packMany(likes, user);
diff --git a/packages/backend/src/server/api/endpoints/i/pages.ts b/packages/backend/src/server/api/endpoints/i/pages.ts
index bef775d063..dbc58021b9 100644
--- a/packages/backend/src/server/api/endpoints/i/pages.ts
+++ b/packages/backend/src/server/api/endpoints/i/pages.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Pages } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:pages',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -37,13 +20,23 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(Pages.createQueryBuilder('page'), ps.sinceId, ps.untilId)
 		.andWhere(`page.userId = :meId`, { meId: user.id });
 
 	const pages = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await Pages.packMany(pages);
diff --git a/packages/backend/src/server/api/endpoints/i/pin.ts b/packages/backend/src/server/api/endpoints/i/pin.ts
index a940d1b99b..a09618ebe8 100644
--- a/packages/backend/src/server/api/endpoints/i/pin.ts
+++ b/packages/backend/src/server/api/endpoints/i/pin.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import { addPinned } from '@/services/i/pin';
 import define from '../../define';
 import { ApiError } from '../../error';
@@ -12,12 +10,6 @@ export const meta = {
 
 	kind: 'write:account',
 
-	params: {
-		noteId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchNote: {
 			message: 'No such note.',
@@ -45,8 +37,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		noteId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['noteId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	await addPinned(user, ps.noteId).catch(e => {
 		if (e.id === '70c4e51f-5bea-449c-a030-53bee3cce202') throw new ApiError(meta.errors.noSuchNote);
 		if (e.id === '15a018eb-58e5-4da1-93be-330fcc5e4e1a') throw new ApiError(meta.errors.pinLimitExceeded);
diff --git a/packages/backend/src/server/api/endpoints/i/read-all-messaging-messages.ts b/packages/backend/src/server/api/endpoints/i/read-all-messaging-messages.ts
index 4e4fb3840f..b0185a3e37 100644
--- a/packages/backend/src/server/api/endpoints/i/read-all-messaging-messages.ts
+++ b/packages/backend/src/server/api/endpoints/i/read-all-messaging-messages.ts
@@ -8,13 +8,16 @@ export const meta = {
 	requireCredential: true,
 
 	kind: 'write:account',
+} as const;
 
-	params: {
-	},
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	// Update documents
 	await MessagingMessages.update({
 		recipientId: user.id,
diff --git a/packages/backend/src/server/api/endpoints/i/read-all-unread-notes.ts b/packages/backend/src/server/api/endpoints/i/read-all-unread-notes.ts
index 99f17ddfc9..45638c2579 100644
--- a/packages/backend/src/server/api/endpoints/i/read-all-unread-notes.ts
+++ b/packages/backend/src/server/api/endpoints/i/read-all-unread-notes.ts
@@ -8,13 +8,16 @@ export const meta = {
 	requireCredential: true,
 
 	kind: 'write:account',
+} as const;
 
-	params: {
-	},
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	// Remove documents
 	await NoteUnreads.delete({
 		userId: user.id,
diff --git a/packages/backend/src/server/api/endpoints/i/read-announcement.ts b/packages/backend/src/server/api/endpoints/i/read-announcement.ts
index e9bb66264b..f3cedddb35 100644
--- a/packages/backend/src/server/api/endpoints/i/read-announcement.ts
+++ b/packages/backend/src/server/api/endpoints/i/read-announcement.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { ApiError } from '../../error';
 import { genId } from '@/misc/gen-id';
@@ -13,12 +11,6 @@ export const meta = {
 
 	kind: 'write:account',
 
-	params: {
-		announcementId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchAnnouncement: {
 			message: 'No such announcement.',
@@ -28,8 +20,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		announcementId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['announcementId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	// Check if announcement exists
 	const announcement = await Announcements.findOne(ps.announcementId);
 
diff --git a/packages/backend/src/server/api/endpoints/i/regenerate-token.ts b/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
index a20719363b..71a3ea08af 100644
--- a/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
+++ b/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import { publishMainStream, publishUserEvent } from '@/services/stream';
 import generateUserToken from '../../common/generate-native-user-token';
@@ -9,16 +8,18 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		password: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
 	},
+	required: ['password'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/registry/get-all.ts b/packages/backend/src/server/api/endpoints/i/registry/get-all.ts
index 2941b441e2..0429cd283a 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/get-all.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/get-all.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 
@@ -6,17 +5,20 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/registry/get-detail.ts b/packages/backend/src/server/api/endpoints/i/registry/get-detail.ts
index 51371353c9..194a922718 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/get-detail.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/get-detail.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 import { ApiError } from '../../../error';
@@ -8,17 +7,6 @@ export const meta = {
 
 	secure: true,
 
-	params: {
-		key: {
-			validator: $.str,
-		},
-
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
-	},
-
 	errors: {
 		noSuchKey: {
 			message: 'No such key.',
@@ -28,8 +16,19 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		key: { type: 'string' },
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
+	},
+	required: ['key'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/registry/get.ts b/packages/backend/src/server/api/endpoints/i/registry/get.ts
index ac617defb0..7d413e3528 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/get.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/get.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 import { ApiError } from '../../../error';
@@ -8,17 +7,6 @@ export const meta = {
 
 	secure: true,
 
-	params: {
-		key: {
-			validator: $.str,
-		},
-
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
-	},
-
 	errors: {
 		noSuchKey: {
 			message: 'No such key.',
@@ -28,8 +16,19 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		key: { type: 'string' },
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
+	},
+	required: ['key'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/registry/keys-with-type.ts b/packages/backend/src/server/api/endpoints/i/registry/keys-with-type.ts
index 0445922188..52e0d6fac5 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/keys-with-type.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/keys-with-type.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 
@@ -6,17 +5,20 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/registry/keys.ts b/packages/backend/src/server/api/endpoints/i/registry/keys.ts
index a3c9d0e5ee..c494ed8f5c 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/keys.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/keys.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 
@@ -6,17 +5,20 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.select('item.key')
 		.where('item.domain IS NULL')
diff --git a/packages/backend/src/server/api/endpoints/i/registry/remove.ts b/packages/backend/src/server/api/endpoints/i/registry/remove.ts
index 08185f224b..5bc55bd297 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/remove.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/remove.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
 import { ApiError } from '../../../error';
@@ -8,17 +7,6 @@ export const meta = {
 
 	secure: true,
 
-	params: {
-		key: {
-			validator: $.str,
-		},
-
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
-	},
-
 	errors: {
 		noSuchKey: {
 			message: 'No such key.',
@@ -28,8 +16,19 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		key: { type: 'string' },
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
+	},
+	required: ['key'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/registry/scopes.ts b/packages/backend/src/server/api/endpoints/i/registry/scopes.ts
index 9de68ac6e8..e04d123a1f 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/scopes.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/scopes.ts
@@ -5,13 +5,16 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-	},
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.select('item.scope')
 		.where('item.domain IS NULL')
diff --git a/packages/backend/src/server/api/endpoints/i/registry/set.ts b/packages/backend/src/server/api/endpoints/i/registry/set.ts
index 27884046b4..c78f4383be 100644
--- a/packages/backend/src/server/api/endpoints/i/registry/set.ts
+++ b/packages/backend/src/server/api/endpoints/i/registry/set.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import { publishMainStream } from '@/services/stream';
 import define from '../../../define';
 import { RegistryItems } from '@/models/index';
@@ -8,25 +7,22 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		key: {
-			validator: $.str.min(1),
-		},
-
-		value: {
-			validator: $.nullable.any,
-		},
-
-		scope: {
-			validator: $.optional.arr($.str.match(/^[a-zA-Z0-9_]+$/)),
-			default: [],
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		key: { type: 'string', minLength: 1 },
+		value: {},
+		scope: { type: 'array', default: [], items: {
+			type: 'string', pattern: /^[a-zA-Z0-9_]+$/.toString().slice(1, -1),
+		} },
 	},
+	required: ['key', 'value'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = RegistryItems.createQueryBuilder('item')
 		.where('item.domain IS NULL')
 		.andWhere('item.userId = :userId', { userId: user.id })
diff --git a/packages/backend/src/server/api/endpoints/i/revoke-token.ts b/packages/backend/src/server/api/endpoints/i/revoke-token.ts
index 51721c5b58..14800346c1 100644
--- a/packages/backend/src/server/api/endpoints/i/revoke-token.ts
+++ b/packages/backend/src/server/api/endpoints/i/revoke-token.ts
@@ -1,23 +1,23 @@
-import $ from 'cafy';
 import define from '../../define';
 import { AccessTokens } from '@/models/index';
-import { ID } from '@/misc/cafy-id';
 import { publishUserEvent } from '@/services/stream';
 
 export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		tokenId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		tokenId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['tokenId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const token = await AccessTokens.findOne(ps.tokenId);
 
 	if (token) {
diff --git a/packages/backend/src/server/api/endpoints/i/signin-history.ts b/packages/backend/src/server/api/endpoints/i/signin-history.ts
index 796e2ec309..468972c239 100644
--- a/packages/backend/src/server/api/endpoints/i/signin-history.ts
+++ b/packages/backend/src/server/api/endpoints/i/signin-history.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Signins } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -8,29 +6,24 @@ export const meta = {
 	requireCredential: true,
 
 	secure: true,
+} as const;
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(Signins.createQueryBuilder('signin'), ps.sinceId, ps.untilId)
 		.andWhere(`signin.userId = :meId`, { meId: user.id });
 
-	const history = await query.take(ps.limit!).getMany();
+	const history = await query.take(ps.limit).getMany();
 
 	return await Promise.all(history.map(record => Signins.pack(record)));
 });
diff --git a/packages/backend/src/server/api/endpoints/i/unpin.ts b/packages/backend/src/server/api/endpoints/i/unpin.ts
index 9c82b74960..895bfd0c28 100644
--- a/packages/backend/src/server/api/endpoints/i/unpin.ts
+++ b/packages/backend/src/server/api/endpoints/i/unpin.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import { removePinned } from '@/services/i/pin';
 import define from '../../define';
 import { ApiError } from '../../error';
@@ -12,12 +10,6 @@ export const meta = {
 
 	kind: 'write:account',
 
-	params: {
-		noteId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchNote: {
 			message: 'No such note.',
@@ -33,8 +25,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		noteId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['noteId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	await removePinned(user, ps.noteId).catch(e => {
 		if (e.id === 'b302d4cf-c050-400a-bbb3-be208681f40c') throw new ApiError(meta.errors.noSuchNote);
 		throw e;
diff --git a/packages/backend/src/server/api/endpoints/i/update-email.ts b/packages/backend/src/server/api/endpoints/i/update-email.ts
index b4479aa50d..1450eabc2a 100644
--- a/packages/backend/src/server/api/endpoints/i/update-email.ts
+++ b/packages/backend/src/server/api/endpoints/i/update-email.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import { publishMainStream } from '@/services/stream';
 import define from '../../define';
 import rndstr from 'rndstr';
@@ -20,16 +19,6 @@ export const meta = {
 		max: 3,
 	},
 
-	params: {
-		password: {
-			validator: $.str,
-		},
-
-		email: {
-			validator: $.optional.nullable.str,
-		},
-	},
-
 	errors: {
 		incorrectPassword: {
 			message: 'Incorrect password.',
@@ -45,8 +34,17 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		password: { type: 'string' },
+		email: { type: 'string', nullable: true },
+	},
+	required: ['password'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneOrFail(user.id);
 
 	// Compare password
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index aec7bbd2e1..0a5188609b 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -1,7 +1,5 @@
 const RE2 = require('re2');
-import $ from 'cafy';
 import * as mfm from 'mfm-js';
-import { ID } from '@/misc/cafy-id';
 import { publishMainStream, publishUserEvent } from '@/services/stream';
 import acceptAllFollowRequests from '@/services/following/requests/accept-all';
 import { publishToFollowers } from '@/services/i/update';
@@ -24,116 +22,6 @@ export const meta = {
 
 	kind: 'write:account',
 
-	params: {
-		name: {
-			validator: $.optional.nullable.use(Users.validateName),
-		},
-
-		description: {
-			validator: $.optional.nullable.use(Users.validateDescription),
-		},
-
-		lang: {
-			validator: $.optional.nullable.str.or(Object.keys(langmap)),
-		},
-
-		location: {
-			validator: $.optional.nullable.use(Users.validateLocation),
-		},
-
-		birthday: {
-			validator: $.optional.nullable.use(Users.validateBirthday),
-		},
-
-		avatarId: {
-			validator: $.optional.nullable.type(ID),
-		},
-
-		bannerId: {
-			validator: $.optional.nullable.type(ID),
-		},
-
-		fields: {
-			validator: $.optional.arr($.object()).range(1, 4),
-		},
-
-		isLocked: {
-			validator: $.optional.bool,
-		},
-
-		isExplorable: {
-			validator: $.optional.bool,
-		},
-
-		hideOnlineStatus: {
-			validator: $.optional.bool,
-		},
-
-		publicReactions: {
-			validator: $.optional.bool,
-		},
-
-		ffVisibility: {
-			validator: $.optional.str,
-		},
-
-		carefulBot: {
-			validator: $.optional.bool,
-		},
-
-		autoAcceptFollowed: {
-			validator: $.optional.bool,
-		},
-
-		noCrawle: {
-			validator: $.optional.bool,
-		},
-
-		isBot: {
-			validator: $.optional.bool,
-		},
-
-		isCat: {
-			validator: $.optional.bool,
-		},
-
-		showTimelineReplies: {
-			validator: $.optional.bool,
-		},
-
-		injectFeaturedNote: {
-			validator: $.optional.bool,
-		},
-
-		receiveAnnouncementEmail: {
-			validator: $.optional.bool,
-		},
-
-		alwaysMarkNsfw: {
-			validator: $.optional.bool,
-		},
-
-		pinnedPageId: {
-			validator: $.optional.nullable.type(ID),
-		},
-
-		mutedWords: {
-			validator: $.optional.arr($.either($.arr($.str.min(1)).min(1), $.str)),
-		},
-
-		mutedInstances: {
-			validator: $.optional.arr($.str),
-		},
-
-		mutingNotificationTypes: {
-			validator: $.optional.arr($.str.or(notificationTypes as unknown as string[])),
-		},
-
-		emailNotificationTypes: {
-			validator: $.optional.arr($.str),
-		},
-	},
-
 	errors: {
 		noSuchAvatar: {
 			message: 'No such avatar file.',
@@ -179,8 +67,60 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		name: { ...Users.nameSchema, nullable: true },
+		description: { ...Users.descriptionSchema, nullable: true },
+		location: { ...Users.locationSchema, nullable: true },
+		birthday: { ...Users.birthdaySchema, nullable: true },
+		lang: { type: 'string', enum: Object.keys(langmap), nullable: true },
+		avatarId: { type: 'string', format: 'misskey:id', nullable: true },
+		bannerId: { type: 'string', format: 'misskey:id', nullable: true },
+		fields: { type: 'array',
+			minItems: 0,
+			maxItems: 8,
+			items: {
+				type: 'object',
+				properties: {
+					name: { type: 'string' },
+					value: { type: 'string' },
+				},
+				required: ['name', 'value'],
+			},
+		},
+		isLocked: { type: 'boolean' },
+		isExplorable: { type: 'boolean' },
+		hideOnlineStatus: { type: 'boolean' },
+		publicReactions: { type: 'boolean' },
+		carefulBot: { type: 'boolean' },
+		autoAcceptFollowed: { type: 'boolean' },
+		noCrawle: { type: 'boolean' },
+		isBot: { type: 'boolean' },
+		isCat: { type: 'boolean' },
+		showTimelineReplies: { type: 'boolean' },
+		injectFeaturedNote: { type: 'boolean' },
+		receiveAnnouncementEmail: { type: 'boolean' },
+		alwaysMarkNsfw: { type: 'boolean' },
+		ffVisibility: { type: 'string', enum: ['public', 'followers', 'private'] },
+		pinnedPageId: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
+		mutedWords: { type: 'array' },
+		mutedInstances: { type: 'array', items: {
+			type: 'string',
+		} },
+		mutingNotificationTypes: { type: 'array', items: {
+			type: 'string', enum: notificationTypes,
+		} },
+		emailNotificationTypes: { type: 'array', items: {
+			type: 'string',
+		} },
+	},
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, _user, token) => {
+export default define(meta, paramDef, async (ps, _user, token) => {
 	const user = await Users.findOneOrFail(_user.id);
 	const isSecure = token == null;
 
diff --git a/packages/backend/src/server/api/endpoints/i/user-group-invites.ts b/packages/backend/src/server/api/endpoints/i/user-group-invites.ts
index 76a3131e6d..6c38240913 100644
--- a/packages/backend/src/server/api/endpoints/i/user-group-invites.ts
+++ b/packages/backend/src/server/api/endpoints/i/user-group-invites.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { UserGroupInvitations } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -11,21 +9,6 @@ export const meta = {
 
 	kind: 'read:user-groups',
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -48,14 +31,24 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const query = makePaginationQuery(UserGroupInvitations.createQueryBuilder('invitation'), ps.sinceId, ps.untilId)
 		.andWhere(`invitation.userId = :meId`, { meId: user.id })
 		.leftJoinAndSelect('invitation.userGroup', 'user_group');
 
 	const invitations = await query
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return await UserGroupInvitations.packMany(invitations);